We used the TCGA database to verify the bioinformatics findings of the 47 differentially expressed genes screened, and found that, among the 47 screened genes, the significant up-regulation or down-regulation of EGFR, CHL1, TRIM13, CDH26, WFDC2, MUC4, ALDH3A1, CLIC6, TPPP3, TMC5 and SERPINB3 in head and neck squamous cell carcinoma were compared with normal samples (Fig. 6). The gene discussed is WFDC2; the disease is head and neck squamous cell carcinoma.